Speed of light determines the lower bound of roundtrip latency, but the sticking point is the upper bound, and that depends on how congested networks are. If s

Speed of light determines the lower bound of roundtrip latency, but the sticking point is the upper bound, and that depends on how congested networks are. If sensors produce more data and data centers can process more data but network capacities can't keep up, then the analysis you are suggesting will show that we need more decentralised processing, not more data centers.